Union of two relations Relations r,s. AB A B 1 2 C 2 B 3 B 1 S r rus: A B C 1 C 2 3 Database System Concepts-6th Edition 2.11 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 2.11 ©Silberschatz, Korth and Sudarshan th Edition Union of two relations Relations r, s: r  s: